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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Components of Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss are as follows:
 
March 31,
2019
 
December 31,
2018
Unrealized loss on investments
$
(14
)
 
$
(61
)
Loss on foreign currency translation adjustments
(28,311
)
 
(28,551
)
Total accumulated other comprehensive loss
$
(28,325
)
 
$
(28,612
)